C1238

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C0210/33,C0215/34,C1238/38,C1239/39: Rear Speed Sensor RH Circuit


DESCRIPTION

Refer to DTC C0200/31, C0205/32, C1235/35 and C1236/36 C0200.





HINT
- DTC C0210/33 and C1238/38 are for the rear speed sensor RH.
- DTC C0215/34 and C1239/39 are for the rear speed sensor LH.
WIRING DIAGRAM





INSEPCTION PROCEDURE

HINT
When using the Techstream, start from*1. When not using the Techstream, start from*2.

PROCEDURE

1. READ VALUE USING TECHSTREAM (REAR SPEED SENSOR)*1

(a) Check the Data List for proper functioning of the rear speed sensor.

ABS/VSC/TRAC





OK:

There is almost no difference in displayed speed value.

HINT
There is tolerance of +/-10% in the speedometer indication.

OK -- INSPECT REAR SPEED SENSOR (INSTALLATION)
NG -- Continue to next step.

2. INSPECT REAR SPEED SENSOR*2





(a) Disconnect the A27 and A28 sensor connectors.

(b) Measure the resistance of the sensors.

Standard resistance:





HINT
Check the speed sensor signal after the speed sensor replacement Scan Tool Testing and Procedures.

NG -- REPLACE REAR SPEED SENSOR
OK -- Continue to next step.

3. CHECK WIRE HARNESS (SKID CONTROL ECU - REAR SPEED SENSOR)





(a) Disconnect the S7 ECU connector.

(b) Measure the resistance of the wire harness side connectors.

Standard resistance:

LH
RH










NG -- REPAIR OR REPLACE HARNESS AND CONNECTOR
OK -- Continue to next step.

4. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS





(a) Connect an oscilloscope to terminals 20 (RR+) and 21 (RR-), and 18 (RL+) and 19 (RL-) of the S7 skid control ECU connector.

(b) Drive the vehicle at about 30 km/h (19 mph), and check the signal waveform.

OK:

Waveform is output as shown in illustration.

HINT
- As vehicle speed (wheel revolution speed) increases, the wavelength shortens and the fluctuation in the output voltage becomes greater.
- When noise is identified in the waveform on the oscilloscope, error signals are generated due to scratches, looseness or foreign matter on the speed sensor rotor.
OK -- REPLACE SKID CONTROL ECU
NG -- Continue to next step.

5. INSPECT REAR SPEED SENSOR (INSTALLATION)





(a) Check the speed sensor installation.

OK:

Installation bolt is tightened properly. There is no clearance between sensor and front steering knuckle.

Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf)

There is no clearance between sensor and rear axle hub.

HINT
Check the speed sensor signal after the speed sensor replacement Scan Tool Testing and Procedures.

NG -- REPLACE REAR SPEED SENSOR
OK -- Continue to next step.

6. INSPECT SPEED SENSOR (TIP)

(a) Remove the rear speed sensor.

(b) Check the sensor rotor serrations.

OK:

No scratches or foreign matter on sensor tip.

HINT
Check the speed sensor signal after the speed sensor cleaning or replacement Scan Tool Testing and Procedures.

NG -- CLEAN OR REPAIR SPEED SENSOR
OK -- Continue to next step.

7. INSPECT SPEED SENSOR ROTOR





(a) Remove the rear drive shaft.

(b) Check the sensor rotor serrations.

OK:

No scratches, missing teeth or foreign matter on sensor rotor.

HINT
- If foreign matter is attached, remove it and after reassembling, check the output waveform.
- Check the speed sensor signal after the rear speed sensor cleaning or replacement Scan Tool Testing and Procedures.
NG -- CLEAN OR REPAIR SPEED SENSOR ROTOR

OK -- REPLACE SKID CONTROL ECU